Dry-pan.



R. G, PENFIEL'D.

DRY PAN, APPLIGATIGH FILED JULY 1'3, 1909.

Patented Nov. 1

2 SHEETEPSHEET l.

R. O. PENFIELD.

DRY PAN.

APPLICATION FILED JULY 13, 1909.

Patented Nov.

2 SHEETS-SHEET 2.

i To all whom it may concern:

ITED STATES PATENT OFFICE? RAYMOND o. ran-FIELD, ornnw roan, a. :Y'.

DRYgPAN.

Be it known that I, RAYMOND C. PEN- FIELD, a citizen of the United States of America, residing at New York city, in the 3 v Y 1' county of how 1 ork and State of how- York, have invented certain new and-useful- Improvements in Dry-Pans, of which the following is a specification, reference-being had therein to the accompanying drawing.

This inventionrelates to a rotary dry pan for. use in the manufacture of clay products.

In other words it may be termed a crushing or grinding mill for grinding and pulverizmg clay and similar substances for use in the manufacture of bricks and m kindred arts, the mill being of that, general class wherein the material to be crushed or reduced is fed under rollers or mullers lo-' cated at opposite sides of the axis of revolu-' tion of the pan and then screened.

One of the principal difficulties with machines of this class is to obtaina large capacity for the space they occupy, and a reason i for not being able to secure a large capacity. has been that the speed of the pan causes speed which will be ordinarily a slower speed, and in combination with these a secondary screening element. capable of running at its own independent speed which can he graduated to suit the needs of the machine and the work it is to perform, to. gether with suitable appliances for securing these different relative speeds and varying and regulating the same; andals o the invention includes a hopper construction having a number of pouches or receptacles for receiving the clay or other material of varying degrees of coarseness, and of enabling the same to be handled so that the flfinal result for the clay may be as fineas is needed.- The -nvent1on furthermore comprises various detailsand peculiarities in the construction,,combination and arrangement of escribed-and claimed.-

parts substantially as will be hereinafter- Specification of Letters Patent. Patented Nov, 1, 1910,

Application filed July 13,1909. Serial No. 507,422.

In the accompanying drawings illustratmg my invention, Figure 1 1s a vertical sectional side elevation of my improved d ry pan. Fig.- 2 is a similar verticalsectional side elevation, illustrating an alternativ form of certain parts of the invention.

Similar characters of reference designate corresponding parts throughout the different figures of the drawing.

1 denotes a pier or foundation of brick, concrete, or other suitable material Qn-whieh the pan is mounted. The main framework of the pan consists 'of side frames 2 which are securely bolted or otherwise firmly fixed at 3 upon the foundation 1. Upon the frames 2 is supported a horizontal'cross frame 4 which is rigidly afiixed to said frames 2. This-frame 4 provides journal bearings 5 and 6, preferably made as roller bearings, in which is rotatably mounted a horizontal shaft 7 whereon is a driving pulley 11 which may obviously be a plain pulley or a tight and loose pulley, either of which will perform the same function as the friction pulley indicated in the drawing.

bracket 8 secured to one of the side frames 2 serves to provide another bearing for the shaft 7, which bearing is at one of the outer ends of shaft 7. The drive pulley 11 is located on the shaft 7- between the'braclcet 8 and the bearing 6. -"Also on the shaft 7.

preferablycontiguous"to the bearing 5, is a beveldriving pinion 12 which meshes with a horizontal master gear wheel 13 that is securely fastened upon the upper end of a vertical main driving shaft 14: which occupics :1 position centrally in the machine. Shaft 14 is supported at its upper end in a bearing 15 constructed near the central point of the horizontal cross frame 4.

9 and 10 designate mullers or grinding wheels which oceupy-aivertical position on oppositeisides of the shaftH and which are rotated by the revolution of the pan beneath them, the material to be crushed being delivered or fed into the pan and brought un- ,der the action of the mullers in their rotation and being thereby crushed; These mullers 9and 10 are supported in any suitable manner upon sha'fts 16 having bearings in the center boxing 17 and in the side frames 2. Since the shaft or journal arrangements lfonsustaining the mullers 9 and 10 and en- .ablm them to. easily revolve may vary a-withm wide I lay, no special claim in thisapplication to any of the detailed construction of said muller shafts.

The grindin pan proper comprises grind- I mg plates 18 w nch work in contact with the by a plurality of horizontal arms 20 that of the initial screening element 23.

are integral with a central hub 21 which is keyed at 22 to the shaft 14 (see Fig. 1). Said frame 19 forms a grinding base. Between the grinding plates 18 and the hub 21 are one or more screen plates that are carried by and revolve with the frame 19 and the muller plates 18. The outer edge of the pan is furthermore provided with a vertical steelrim 24 secured to the frame 19. The material that is crushed upon the muller plates 18 by the action of the mullers 9 and 10 is scraped upon the screen plates23, and the finer particles pass through the same and are received below upon a secondary horizontal screen T he. coarser material that will not pass through the mesh of the screen 25 passes over the edge thereof and falls into a hopper 26 which I term a tailings hopper, from which it can be elevated and reground. 'lhe finer material, however, which falls through the screen drops into another hopper 27 which I term a screened clay hopper, and can be transferred therefrom by any suitable means to any point where it is needed. The horizontal screen 2'5 rotates at a comparatively slow speed in a manner which lshall presently point out.

The muller grinding plates 18 and the mullers and travel faster than the screen plates 23, because said muller plates 18 are on the outer periphery of the pan, and hence on a faster moving portion thereof; while the screen plates 23, being nearer the center of the pan, move more slowly. \Vhen the ground material falls through the screen 23 and drops upon the screen 25, the best results are obtained because said secondary screen has an independent speed; or, in other words, it operates at a speed which is entirely independentof the speed Since the muller plates and the mnllers are on the outside of the screening'plates 23 instead of on the inside, which is the more common and usual construetion,it-' must be understood that the grinding plates and mullers can be run at a much faster speed; while the screen plates 23 run more slowly, thus giving more time for the fine material to pass through.

.. Supported in suitable journal bearings is horizontal shaft 28, on which, near its in.- ner end, is a pinion 29 which meshes with a gear wheel 30 forming a part of the frame 31 of the secondary screen 25, which frame revolves loosely around a stationary hub 32.

This hub 32 forms a part 'of a gear casing I 33. The end of the shaft 28 is received into abearing 34 which forms a part of the stationary hub 32. On the other endof the shaft 28 from where the pinion 29 is located is a sprocket wheel 35 around which passes a chain 36 that" also passes around and engages a sprocket wheel 37 on the end of the upper shaft. 7. In this manner motion is communicated from the top shaft 7 to the shaft 28 which operates the secondary screening device. In lieu of the sprocket wheels 35 and 37 and chain 36, as shown in Fig. 1, I may substitute gear wheels or pulley devices; or any other convenient means for driving theshaft 28 may be employed.

Gearing connections for this purpose are indicated in Fig. 2 and will be afterward more fully described..

At 38 I illustrate a step bearing for the lower end of the main driving shaft 14, which bearingmay vary widely in its detailed construction. This step bearing serves also to supportthe stationary hub 32 and the gear casing,. The rinding base orthe pan proper is provided with an encircling ring 24 of reater or'less height.

In the f in Fig. 2, the mullers 9 and 10 and the muller plates 18 are supported upon a frame 19 held by the arms 20 projecting from the central hub '21 which is keyed at 22 to the shaft 14; and screen plates 23 are 10- cated between the muller plates 18 and the central vertical driving shaft 14" but the screen plates .23 are not carried in this instance by the frame that supports the muller plates, but are supported on an independent screen-supporting frame consisting of an puter rim 39, a plurality of arms 40, and a central hub 41, which hub is mounted loosely upon the vertical shaft 14 and rotates easily thereon. Secured by bolts 57 to the upper end of the hub 41 is av bevel gear wheel 42 with which meshes a pinion- 43 mounted on one end of a horizontal shaft- 44. Said shaft 44 is supported at one end by a journal bearing 45 which forms a part of a gear casing 46, and at the other end is carried in a bearing 47 in one of the vertical side frames 2.

()n the outer end of the shaft 44 is a miter pinion 49 that meshes with another miter pinion it!) ona vertical shaft 50. Shaft 50 is suitably supported in l'iearings provided by brackets 53, 54 and 58 on .the side of one of the frames 2. At the upper end of the shaft 50 is a miter pinion 51 which meshes with a corresponding miter pinion 52 on the end of the upper shaft 7. in this way it will be seen that motion is communicated from said driving shaft 7 to the verenact the invention illustrated a miter pinion 5t; -'hi ch' meshes with and, actuates another miter n'nion 55 on .,tlie. outer-1 end of the lower horizontal shaftQSlwhich is arranged intlie same-mam {1S in'Fig. 1, and has jfor'its tautncr as it.

tion-the lriving of the, secondary screening device.2o.' Thus it will-"be seen that the central vertical drive shaft H'actuates the pan proper or the main grinding base, as -it is termed, which carries the grinding plates 18, and drives -the same-at a certain speed-.1 Also, it is evident that 'through the from that of the main grinding device and is gene ally slower. .-\lso, it seen that v throughthe miter gears 05 and at), the shaft- :28 and the gears 21) and 30, the secondary screening device which receives the. material that, falls through the primary screen is driven at a rate of revolution different: from either that ofthe grinding element or the.

primary screening element. There is thus imparted to the three distinct elements which act won 'the material, viz. the grinder and the two screens, three distinct and independent movements whose "degree and ate can be relatively regulated in the mannerrequired. So that in the combination shown in Fig. 2 the' lliititllgtl to be ground, crushed, or pulverized obviously passes first into the pan and-under the mullers t) and 10 with the usual result of grinding the material. It is then directed by scrapers on to the primary screening device :23, which, as I have said, has a difi'ercnt speed from the grinding plates. The screened material falls from the primary screening device upon the secondary screen which has a still differentspeed.

Such coarser material .as will not pass through thescreen 25 is thrown off toone side and falls into the 'tailings hopper 26. The finer materiahhowever, 'which is of the requisite degree of fineness drops into the screened clay hopper 2.7. and carried away therefrom to be used as needed. The coarse material is taken fronrthe tailings hopper back into thepan by any suital mechanism. so that it may be reground. The details of construction of the hopper devices 26 and 27 may vary greatly. In general, it may be said that they are of coni -al shape, the tailings hopper .26 being of larger diameter than the screened clay hopper 27. They have suitable outlets at the lower end or on the side. from which their contents are removed with facility. 'lhey are supported in any desired mannerand are arranged properly beneath the screening mechanism so that the ground substancys may. pass readily thereinto. Thus, while in Fig. 1 the. grinding device and the pri- "niary screen have. a joint revolution, being both carried by the same revolving support, 111 Fig. 2, theyrevolve ndependently, as also doesjthe'secondary screen. In Fig. 1-

therevolution of the grinding base is faster than that of-the primary screen because it is onzthe outeigperiphery of the pan, but the two rotate-m unison.

lnl ig. 2, however, the primary screen may. have a dc:-

Icidcdly slower rate of revolution,- being driven independently of the grinding element. Thus I aiir enabled to provide for differentmethods of running the prin'iary and secondary screening devices at different speeds from thatat which the grinding plates and the mullers are operated, in order to prevent the ground material from passing over the screen plates too rapidly to be 'roperly. screened; and by this improved a echanism I also am enabled to pass the m'athrial first through a primary coarser sc'recnfapd' then through a secondary finer screen running at independent speeds and each indepehdent of the grinding base, in-

order to} increase the capacity of the pan and enable, the power to be reduced correspondingly with the capacity.

Many changes in the construction, combination and arrangen'ient of the various parts may obviously be made without ert- .ceedingdl'ie scope of the appended claims, and I therefore reserve the liberty of making such needfnl changes in this respect as experience may suggest.

Having thus described my invention, What I claim ramand desire to secure by Letters Patent, is:

1. In a dry pan. the combination of 'a grinding member, a screening member, the latter being concentric with and inside of the grinding member, means for supporting and jointly rotating the said members, and an independently rotating secondary screening device below the first screen.

9. In a dry pan, the combination of grinding mechanism. mullers arranged to operate in, connection .therewith. a screening membe f n' cansfor jointly supporting the grinding member and the screening memher. and an independently 'rotating secondary screening element below the first one and having a finer mesh.

In a dry pan, the combination of a grinding base, mnllers operating in connection therewith','a primary screen concentric with said base and having a coarse mesh, an independently rotating secondary screen below' the first: and having a fine mesh, :1 screened clay hopper for receiving the material from the secondary screen, and a tail-.

grinding base and mailers, of a primary screen which receives the material from the inullers, an independently. rotating see ondary screen below the first screen for screening the material more finely than the first screen, and receptacles for receiving screened material of different degrees of fineness.

5. In a dry pan, the combination of grinding plates, mullers working thereon, a screening element concentric with and receiving material from the plates and mullers, an independently rotating secondary screening element below the first" screen, a tailings hopper receiving the coarse material thrown 'ofi' the secondary screen, and a screened clay hopper for receiving the fine material which passes through the secondary screen.

6. In a dry pan, the combination of a grinding base having an encircling rim, lnullers working thereon, a screen concentric with and inside of the grinding base and receiving the material therefrom, a secondary screen below the first, means for driving the secondary screen at a different rate of revolution from that of the other rotary elements, conical concentric hoppers beneath the screen devices for receiving material of different degrees of fineness. v

In testimony whereof I afiix my signature in presence of two witnesses.

RAYMQN D .C.-'PENFIELD.

W itnesscs Jmnnn'r'rn S'ronK, C. B. SCHROEDER. 

